The emergency department triage nurse receives notification there has been a mass shooting incident at a local shopping mall with several casualties injured. The hospital’s emergency response plan is initiated. Which client should the nurse prioritize for care?

Client with a sucking chest wound, conscious, blood pressure 88/58 mm Hg, heart rate 115/min, and red tag observed.

Client with a significant penetrating head wound, unconscious with irregular breathing pattern, and black tag observed.

Client with superficial lacerations to the left arm and left lower leg.

Client with closed left lower leg injury, air cast in place, pain reported as 9 on a 0 to 10 numeric pain scale.